The shedding of clots occurs when menstrual blood is expelled rapidly from the body during the period, according to WebMD. This rapid expulsion does not allow adequate time for the anticoagulants released by the body to prevent blood from clotting.
Normally, rapid blood expulsion occurs when blood flow is heaviest; usually during the first few days of a period, explains WebMD. Normally, anticoagulants released by the body break down thicker menstrual blood as it leaves the body, which keeps the blood free of clots, explains RubyCup.
However, when there is quick expulsion of menstrual blood, there is not enough time for the anticoagulants to confer their effects, resulting in clot formation. This causes multiple clots to be released along with the menstrual blood, making it appear denser than usual, reports WebMD.
The clots may vary in color and consistency, but are typically dark or bright red in color, explain experts at Ruby Cup. While such clots are common and do not require medical treatment, if clots are thick and larger than a quarter or there is excessive clotting along with heavy bleeding every month, the condition merits a visit to the doctor to rule out any underlying health condition, reports WebMD.